wp-content/plugins/akismet/class.akismet.php

   1 <?php
   2
   3 class Akismet {
   4         const API_HOST = 'rest.akismet.com';
   5         const API_PORT = 80;
   6         const MAX_DELAY_BEFORE_MODERATION_EMAIL = 86400; // One day in seconds
   7
   8         private static $last_comment = '';
   9         private static $initiated = false;
  10         private static $prevent_moderation_email_for_these_comments = array();
  11         private static $last_comment_result = null;
  12
  13         public static function init() {
  14                 if ( ! self::$initiated ) {
  15                         self::init_hooks();
  16                 }
  17         }
  18
  19         /**
  20          * Initializes WordPress hooks
  21          */
  22         private static function init_hooks() {
  23                 self::$initiated = true;
  24
  25                 add_action( 'wp_insert_comment', array( 'Akismet', 'auto_check_update_meta' ), 10, 2 );
  26                 add_action( 'preprocess_comment', array( 'Akismet', 'auto_check_comment' ), 1 );
  27                 add_action( 'akismet_scheduled_delete', array( 'Akismet', 'delete_old_comments' ) );
  28                 add_action( 'akismet_scheduled_delete', array( 'Akismet', 'delete_old_comments_meta' ) );
  29                 add_action( 'akismet_schedule_cron_recheck', array( 'Akismet', 'cron_recheck' ) );
  30
  31                 $akismet_comment_nonce_option = apply_filters( 'akismet_comment_nonce', get_option( 'akismet_comment_nonce' ) );
  32
  33                 if ( $akismet_comment_nonce_option == 'true' || $akismet_comment_nonce_option == '' )
  34                         add_action( 'comment_form',  array( 'Akismet',  'add_comment_nonce' ), 1 );
  35
  36                 add_action( 'admin_footer-edit-comments.php', array( 'Akismet', 'load_form_js' ) );
  37                 add_action( 'comment_form', array( 'Akismet', 'load_form_js' ) );
  38                 add_action( 'comment_form', array( 'Akismet', 'inject_ak_js' ) );
  39
  40                 add_filter( 'comment_moderation_recipients', array( 'Akismet', 'disable_moderation_emails_if_unreachable' ), 1000, 2 );
  41                 add_filter( 'pre_comment_approved', array( 'Akismet', 'last_comment_status' ), 10, 2 );
  42
  43                 if ( '3.0.5' == $GLOBALS['wp_version'] ) {
  44                         remove_filter( 'comment_text', 'wp_kses_data' );
  45                         if ( is_admin() )
  46                                 add_filter( 'comment_text', 'wp_kses_post' );
  47                 }
  48         }
  49
  50         public static function get_api_key() {
  51                 return defined('WPCOM_API_KEY') ? constant('WPCOM_API_KEY') : get_option('wordpress_api_key');
  52         }
  53
  54         public static function check_key_status( $key, $ip = null ) {
  55                 return self::http_post( http_build_query( array( 'key' => $key, 'blog' => get_option('home') ) ), 'verify-key', $ip );
  56         }
  57
  58         public static function verify_key( $key, $ip = null ) {
  59                 $response = self::check_key_status( $key, $ip );
  60
  61                 if ( $response[1] != 'valid' && $response[1] != 'invalid' )
  62                         return 'failed';
  63
  64                 self::update_alert( $response );
  65
  66                 return $response[1];
  67         }
  68
  69         public static function auto_check_comment( $commentdata ) {
  70                 self::$last_comment_result = null;
  71
  72                 $comment = $commentdata;
  73
  74                 $comment['user_ip']      = self::get_ip_address();
  75                 $comment['user_agent']   = self::get_user_agent();
  76                 $comment['referrer']     = self::get_referer();
  77                 $comment['blog']         = get_option('home');
  78                 $comment['blog_lang']    = get_locale();
  79                 $comment['blog_charset'] = get_option('blog_charset');
  80                 $comment['permalink']    = get_permalink( $comment['comment_post_ID'] );
  81
  82                 if ( !empty( $comment['user_ID'] ) )
  83                         $comment['user_role'] = Akismet::get_user_roles( $comment['user_ID'] );
  84
  85                 $akismet_nonce_option = apply_filters( 'akismet_comment_nonce', get_option( 'akismet_comment_nonce' ) );
  86                 $comment['akismet_comment_nonce'] = 'inactive';
  87                 if ( $akismet_nonce_option == 'true' || $akismet_nonce_option == '' ) {
  88                         $comment['akismet_comment_nonce'] = 'failed';
  89                         if ( isset( $_POST['akismet_comment_nonce'] ) && wp_verify_nonce( $_POST['akismet_comment_nonce'], 'akismet_comment_nonce_' . $comment['comment_post_ID'] ) )
  90                                 $comment['akismet_comment_nonce'] = 'passed';
  91
  92                         // comment reply in wp-admin
  93                         if ( isset( $_POST['_ajax_nonce-replyto-comment'] ) && check_ajax_referer( 'replyto-comment', '_ajax_nonce-replyto-comment' ) )
  94                                 $comment['akismet_comment_nonce'] = 'passed';
  95
  96                 }
  97
  98                 if ( self::is_test_mode() )
  99                         $comment['is_test'] = 'true';
 100
 101                 foreach( $_POST as $key => $value ) {
 102                         if ( is_string( $value ) )
 103                                 $comment["POST_{$key}"] = $value;
 104                 }
 105
 106                 $ignore = array( 'HTTP_COOKIE', 'HTTP_COOKIE2', 'PHP_AUTH_PW' );
 107
 108                 foreach ( $_SERVER as $key => $value ) {
 109                         if ( !in_array( $key, $ignore ) && is_string($value) )
 110                                 $comment["$key"] = $value;
 111                         else
 112                                 $comment["$key"] = '';
 113                 }
 114
 115                 $post = get_post( $comment['comment_post_ID'] );
 116                 $comment[ 'comment_post_modified_gmt' ] = $post->post_modified_gmt;
 117
 118                 $response = self::http_post( http_build_query( $comment ), 'comment-check' );
 119
 120                 do_action( 'akismet_comment_check_response', $response );
 121
 122                 self::update_alert( $response );
 123
 124                 $commentdata['comment_as_submitted'] = $comment;
 125                 $commentdata['akismet_result']       = $response[1];
 126
 127                 if ( isset( $response[0]['x-akismet-pro-tip'] ) )
 128                 $commentdata['akismet_pro_tip'] = $response[0]['x-akismet-pro-tip'];
 129
 130                 if ( 'true' == $response[1] ) {
 131                         // akismet_spam_count will be incremented later by comment_is_spam()
 132                         self::$last_comment_result = 'spam';
 133
 134                         $discard = ( isset( $commentdata['akismet_pro_tip'] ) && $commentdata['akismet_pro_tip'] === 'discard' && self::allow_discard() );
 135
 136                         do_action( 'akismet_spam_caught', $discard );
 137
 138                         if ( $discard ) {
 139                                 // akismet_result_spam() won't be called so bump the counter here
 140                                 if ( $incr = apply_filters('akismet_spam_count_incr', 1) )
 141                                         update_option( 'akismet_spam_count', get_option('akismet_spam_count') + $incr );
 142                                 $redirect_to = isset( $_SERVER['HTTP_REFERER'] ) ? $_SERVER['HTTP_REFERER'] : get_permalink( $post );
 143                                 wp_safe_redirect( esc_url_raw( $redirect_to ) );
 144                                 die();
 145                         }
 146                 }
 147
 148                 // if the response is neither true nor false, hold the comment for moderation and schedule a recheck
 149                 if ( 'true' != $response[1] && 'false' != $response[1] ) {
 150                         if ( !current_user_can('moderate_comments') ) {
 151                                 // Comment status should be moderated
 152                                 self::$last_comment_result = '0';
 153                         }
 154                         if ( function_exists('wp_next_scheduled') && function_exists('wp_schedule_single_event') ) {
 155                                 if ( !wp_next_scheduled( 'akismet_schedule_cron_recheck' ) ) {
 156                                         wp_schedule_single_event( time() + 1200, 'akismet_schedule_cron_recheck' );
 157                                 }
 158                         }
 159
 160                         self::$prevent_moderation_email_for_these_comments[] = $commentdata;
 161                 }
 162
 163                 if ( function_exists('wp_next_scheduled') && function_exists('wp_schedule_event') ) {
 164                         // WP 2.1+: delete old comments daily
 165                         if ( !wp_next_scheduled( 'akismet_scheduled_delete' ) )
 166                                 wp_schedule_event( time(), 'daily', 'akismet_scheduled_delete' );
 167                 }
 168                 elseif ( (mt_rand(1, 10) == 3) ) {
 169                         // WP 2.0: run this one time in ten
 170                         self::delete_old_comments();
 171                 }
 172
 173                 self::set_last_comment( $commentdata );
 174                 self::fix_scheduled_recheck();
 175
 176                 return self::$last_comment;
 177         }
 178
 179         public static function get_last_comment() {
 180                 return self::$last_comment;
 181         }
 182
 183         public static function set_last_comment( $comment ) {
 184                 if ( is_null( $comment ) ) {
 185                         self::$last_comment = null;
 186                 }
 187                 else {
 188                         // We filter it here so that it matches the filtered comment data that we'll have to compare against later.
 189                         // wp_filter_comment expects comment_author_IP
 190                         self::$last_comment = wp_filter_comment(
 191                                 array_merge(
 192                                         array( 'comment_author_IP' => self::get_ip_address() ),
 193                                         $comment
 194                                 )
 195                         );
 196                 }
 197         }
 198
 199         // this fires on wp_insert_comment.  we can't update comment_meta when auto_check_comment() runs
 200         // because we don't know the comment ID at that point.
 201         public static function auto_check_update_meta( $id, $comment ) {
 202
 203                 // failsafe for old WP versions
 204                 if ( !function_exists('add_comment_meta') )
 205                         return false;
 206
 207                 if ( !isset( self::$last_comment['comment_author_email'] ) )
 208                         self::$last_comment['comment_author_email'] = '';
 209
 210                 // wp_insert_comment() might be called in other contexts, so make sure this is the same comment
 211                 // as was checked by auto_check_comment
 212                 if ( is_object( $comment ) && !empty( self::$last_comment ) && is_array( self::$last_comment ) ) {
 213                         if ( self::matches_last_comment( $comment ) ) {
 214
 215                                         load_plugin_textdomain( 'akismet' );
 216
 217                                         // normal result: true or false
 218                                         if ( self::$last_comment['akismet_result'] == 'true' ) {
 219                                                 update_comment_meta( $comment->comment_ID, 'akismet_result', 'true' );
 220                                                 self::update_comment_history( $comment->comment_ID, __('Akismet caught this comment as spam', 'akismet'), 'check-spam' );
 221                                                 if ( $comment->comment_approved != 'spam' )
 222                                                         self::update_comment_history( $comment->comment_ID, sprintf( __('Comment status was changed to %s', 'akismet'), $comment->comment_approved), 'status-changed'.$comment->comment_approved );
 223                                         }
 224                                         elseif ( self::$last_comment['akismet_result'] == 'false' ) {
 225                                                 update_comment_meta( $comment->comment_ID, 'akismet_result', 'false' );
 226                                                 self::update_comment_history( $comment->comment_ID, __('Akismet cleared this comment', 'akismet'), 'check-ham' );
 227                                                 if ( $comment->comment_approved == 'spam' ) {
 228                                                         if ( wp_blacklist_check($comment->comment_author, $comment->comment_author_email, $comment->comment_author_url, $comment->comment_content, $comment->comment_author_IP, $comment->comment_agent) )
 229                                                                 self::update_comment_history( $comment->comment_ID, __('Comment was caught by wp_blacklist_check', 'akismet'), 'wp-blacklisted' );
 230                                                         else
 231                                                                 self::update_comment_history( $comment->comment_ID, sprintf( __('Comment status was changed to %s', 'akismet'), $comment->comment_approved), 'status-changed-'.$comment->comment_approved );
 232                                                 }
 233                                         } // abnormal result: error
 234                                         else {
 235                                                 update_comment_meta( $comment->comment_ID, 'akismet_error', time() );
 236                                                 self::update_comment_history( $comment->comment_ID, sprintf( __('Akismet was unable to check this comment (response: %s), will automatically retry again later.', 'akismet'), substr(self::$last_comment['akismet_result'], 0, 50)), 'check-error' );
 237                                         }
 238
 239                                         // record the complete original data as submitted for checking
 240                                         if ( isset( self::$last_comment['comment_as_submitted'] ) )
 241                                                 update_comment_meta( $comment->comment_ID, 'akismet_as_submitted', self::$last_comment['comment_as_submitted'] );
 242
 243                                         if ( isset( self::$last_comment['akismet_pro_tip'] ) )
 244                                                 update_comment_meta( $comment->comment_ID, 'akismet_pro_tip', self::$last_comment['akismet_pro_tip'] );
 245                         }
 246                 }
 247         }
 248
 249         public static function delete_old_comments() {
 250                 global $wpdb;
 251
 252                 while( $comment_ids = $wpdb->get_col( $wpdb->prepare( "SELECT comment_id FROM {$wpdb->comments} WHERE DATE_SUB(NOW(), INTERVAL 15 DAY) > comment_date_gmt AND comment_approved = 'spam' LIMIT %d", defined( 'AKISMET_DELETE_LIMIT' ) ? AKISMET_DELETE_LIMIT : 10000 ) ) ) {
 253                         if ( empty( $comment_ids ) )
 254                                 return;
 255
 256                         $wpdb->queries = array();
 257
 258                         do_action( 'delete_comment', $comment_ids );
 259
 260                         $comma_comment_ids = implode( ', ', array_map('intval', $comment_ids) );
 261
 262                         $wpdb->query("DELETE FROM {$wpdb->comments} WHERE comment_id IN ( $comma_comment_ids )");
 263                         $wpdb->query("DELETE FROM {$wpdb->commentmeta} WHERE comment_id IN ( $comma_comment_ids )");
 264
 265                         clean_comment_cache( $comment_ids );
 266                 }
 267
 268                 if ( apply_filters( 'akismet_optimize_table', ( mt_rand(1, 5000) == 11), $wpdb->comments ) ) // lucky number
 269                         $wpdb->query("OPTIMIZE TABLE {$wpdb->comments}");
 270         }
 271
 272         public static function delete_old_comments_meta() {
 273                 global $wpdb;
 274
 275                 $interval = apply_filters( 'akismet_delete_commentmeta_interval', 15 );
 276
 277                 # enfore a minimum of 1 day
 278                 $interval = absint( $interval );
 279                 if ( $interval < 1 )
 280                         $interval = 1;
 281
 282                 // akismet_as_submitted meta values are large, so expire them
 283                 // after $interval days regardless of the comment status
 284                 while ( $comment_ids = $wpdb->get_col( $wpdb->prepare( "SELECT m.comment_id FROM {$wpdb->commentmeta} as m INNER JOIN {$wpdb->comments} as c USING(comment_id) WHERE m.meta_key = 'akismet_as_submitted' AND DATE_SUB(NOW(), INTERVAL %d DAY) > c.comment_date_gmt LIMIT 10000", $interval ) ) ) {
 285                         if ( empty( $comment_ids ) )
 286                                 return;
 287
 288                         $wpdb->queries = array();
 289
 290                         foreach ( $comment_ids as $comment_id ) {
 291                                 delete_comment_meta( $comment_id, 'akismet_as_submitted' );
 292                         }
 293                 }
 294
 295                 if ( apply_filters( 'akismet_optimize_table', ( mt_rand(1, 5000) == 11), $wpdb->commentmeta ) ) // lucky number
 296                         $wpdb->query("OPTIMIZE TABLE {$wpdb->commentmeta}");
 297         }
 298
 299         // how many approved comments does this author have?
 300         public static function get_user_comments_approved( $user_id, $comment_author_email, $comment_author, $comment_author_url ) {
 301                 global $wpdb;
 302
 303                 if ( !empty( $user_id ) )
 304                         return (int) $wpdb->get_var( $wpdb->prepare( "SELECT COUNT(*) FROM {$wpdb->comments} WHERE user_id = %d AND comment_approved = 1", $user_id ) );
 305
 306                 if ( !empty( $comment_author_email ) )
 307                         return (int) $wpdb->get_var( $wpdb->prepare( "SELECT COUNT(*) FROM {$wpdb->comments} WHERE comment_author_email = %s AND comment_author = %s AND comment_author_url = %s AND comment_approved = 1", $comment_author_email, $comment_author, $comment_author_url ) );
 308
 309                 return 0;
 310         }
 311
 312         // get the full comment history for a given comment, as an array in reverse chronological order
 313         public static function get_comment_history( $comment_id ) {
 314
 315                 // failsafe for old WP versions
 316                 if ( !function_exists('add_comment_meta') )
 317                         return false;
 318
 319                 $history = get_comment_meta( $comment_id, 'akismet_history', false );
 320                 usort( $history, array( 'Akismet', '_cmp_time' ) );
 321                 return $history;
 322         }
 323
 324         // log an event for a given comment, storing it in comment_meta
 325         public static function update_comment_history( $comment_id, $message, $event=null ) {
 326                 global $current_user;
 327
 328                 // failsafe for old WP versions
 329                 if ( !function_exists('add_comment_meta') )
 330                         return false;
 331
 332                 $user = '';
 333                 if ( is_object( $current_user ) && isset( $current_user->user_login ) )
 334                         $user = $current_user->user_login;
 335
 336                 $event = array(
 337                         'time'    => self::_get_microtime(),
 338                         'message' => $message,
 339                         'event'   => $event,
 340                         'user'    => $user,
 341                 );
 342
 343                 // $unique = false so as to allow multiple values per comment
 344                 $r = add_comment_meta( $comment_id, 'akismet_history', $event, false );
 345         }
 346
 347         public static function check_db_comment( $id, $recheck_reason = 'recheck_queue' ) {
 348                 global $wpdb;
 349
 350                 $c = $wpdb->get_row( $wpdb->prepare( "SELECT * FROM {$wpdb->comments} WHERE comment_ID = %d", $id ), ARRAY_A );
 351                 if ( !$c )
 352                         return;
 353
 354                 $c['user_ip']        = $c['comment_author_IP'];
 355                 $c['user_agent']     = $c['comment_agent'];
 356                 $c['referrer']       = '';
 357                 $c['blog']           = get_option('home');
 358                 $c['blog_lang']      = get_locale();
 359                 $c['blog_charset']   = get_option('blog_charset');
 360                 $c['permalink']      = get_permalink($c['comment_post_ID']);
 361                 $c['recheck_reason'] = $recheck_reason;
 362
 363                 if ( self::is_test_mode() )
 364                         $c['is_test'] = 'true';
 365
 366                 $response = self::http_post( http_build_query( $c ), 'comment-check' );
 367
 368                 return ( is_array( $response ) && ! empty( $response[1] ) ) ? $response[1] : false;
 369         }
 370
 371         public static function cron_recheck() {
 372                 global $wpdb;
 373
 374                 $api_key = self::get_api_key();
 375
 376                 $status = self::verify_key( $api_key );
 377                 if ( get_option( 'akismet_alert_code' ) || $status == 'invalid' ) {
 378                         // since there is currently a problem with the key, reschedule a check for 6 hours hence
 379                         wp_schedule_single_event( time() + 21600, 'akismet_schedule_cron_recheck' );
 380                         return false;
 381                 }
 382
 383                 delete_option('akismet_available_servers');
 384
 385                 $comment_errors = $wpdb->get_col( "SELECT comment_id FROM {$wpdb->commentmeta} WHERE meta_key = 'akismet_error' LIMIT 100" );
 386
 387                 load_plugin_textdomain( 'akismet' );
 388
 389                 foreach ( (array) $comment_errors as $comment_id ) {
 390                         // if the comment no longer exists, or is too old, remove the meta entry from the queue to avoid getting stuck
 391                         $comment = get_comment( $comment_id );
 392                         if ( !$comment || strtotime( $comment->comment_date_gmt ) < strtotime( "-15 days" ) ) {
 393                                 delete_comment_meta( $comment_id, 'akismet_error' );
 394                                 delete_comment_meta( $comment_id, 'akismet_delayed_moderation_email' );
 395                                 continue;
 396                         }
 397
 398                         add_comment_meta( $comment_id, 'akismet_rechecking', true );
 399                         $status = self::check_db_comment( $comment_id, 'retry' );
 400
 401                         $msg = '';
 402                         if ( $status == 'true' ) {
 403                                 $msg = __( 'Akismet caught this comment as spam during an automatic retry.' , 'akismet');
 404                         } elseif ( $status == 'false' ) {
 405                                 $msg = __( 'Akismet cleared this comment during an automatic retry.' , 'akismet');
 406                         }
 407
 408                         // If we got back a legit response then update the comment history
 409                         // other wise just bail now and try again later.  No point in
 410                         // re-trying all the comments once we hit one failure.
 411                         if ( !empty( $msg ) ) {
 412                                 delete_comment_meta( $comment_id, 'akismet_error' );
 413                                 self::update_comment_history( $comment_id, $msg, 'cron-retry' );
 414                                 update_comment_meta( $comment_id, 'akismet_result', $status );
 415                                 // make sure the comment status is still pending.  if it isn't, that means the user has already moved it elsewhere.
 416                                 $comment = get_comment( $comment_id );
 417                                 if ( $comment && 'unapproved' == wp_get_comment_status( $comment_id ) ) {
 418                                         if ( $status == 'true' ) {
 419                                                 wp_spam_comment( $comment_id );
 420                                         } elseif ( $status == 'false' ) {
 421                                                 // comment is good, but it's still in the pending queue.  depending on the moderation settings
 422                                                 // we may need to change it to approved.
 423                                                 if ( check_comment($comment->comment_author, $comment->comment_author_email, $comment->comment_author_url, $comment->comment_content, $comment->comment_author_IP, $comment->comment_agent, $comment->comment_type) )
 424                                                         wp_set_comment_status( $comment_id, 1 );
 425                                                 else if ( get_comment_meta( $comment_id, 'akismet_delayed_moderation_email', true ) )
 426                                                         wp_notify_moderator( $comment_id );
 427                                         }
 428                                 }
 429
 430                                 delete_comment_meta( $comment_id, 'akismet_delayed_moderation_email' );
 431                         } else {
 432                                 // If this comment has been pending moderation for longer than MAX_DELAY_BEFORE_MODERATION_EMAIL,
 433                                 // send a moderation email now.
 434                                 if ( ( intval( gmdate( 'U' ) ) - strtotime( $comment->comment_date_gmt ) ) < self::MAX_DELAY_BEFORE_MODERATION_EMAIL ) {
 435                                         delete_comment_meta( $comment_id, 'akismet_delayed_moderation_email' );
 436                                         wp_notify_moderator( $comment_id );
 437                                 }
 438
 439                                 delete_comment_meta( $comment_id, 'akismet_rechecking' );
 440                                 wp_schedule_single_event( time() + 1200, 'akismet_schedule_cron_recheck' );
 441                                 return;
 442                         }
 443                         delete_comment_meta( $comment_id, 'akismet_rechecking' );
 444                 }
 445
 446                 $remaining = $wpdb->get_var( "SELECT COUNT(*) FROM {$wpdb->commentmeta} WHERE meta_key = 'akismet_error'" );
 447                 if ( $remaining && !wp_next_scheduled('akismet_schedule_cron_recheck') ) {
 448                         wp_schedule_single_event( time() + 1200, 'akismet_schedule_cron_recheck' );
 449                 }
 450         }
 451
 452         public static function fix_scheduled_recheck() {
 453                 $future_check = wp_next_scheduled( 'akismet_schedule_cron_recheck' );
 454                 if ( !$future_check ) {
 455                         return;
 456                 }
 457
 458                 if ( get_option( 'akismet_alert_code' ) > 0 ) {
 459                         return;
 460                 }
 461
 462                 $check_range = time() + 1200;
 463                 if ( $future_check > $check_range ) {
 464                         wp_clear_scheduled_hook( 'akismet_schedule_cron_recheck' );
 465                         wp_schedule_single_event( time() + 300, 'akismet_schedule_cron_recheck' );
 466                 }
 467         }
 468
 469         public static function add_comment_nonce( $post_id ) {
 470                 echo '<p style="display: none;">';
 471                 wp_nonce_field( 'akismet_comment_nonce_' . $post_id, 'akismet_comment_nonce', FALSE );
 472                 echo '</p>';
 473         }
 474
 475         public static function is_test_mode() {
 476                 return defined('AKISMET_TEST_MODE') && AKISMET_TEST_MODE;
 477         }
 478
 479         public static function allow_discard() {
 480                 if ( defined( 'DOING_AJAX' ) && DOING_AJAX )
 481                         return false;
 482                 if ( is_user_logged_in() )
 483                         return false;
 484
 485                 return ( get_option( 'akismet_strictness' ) === '1'  );
 486         }
 487
 488         public static function get_ip_address() {
 489                 return isset( $_SERVER['REMOTE_ADDR'] ) ? $_SERVER['REMOTE_ADDR'] : null;
 490         }
 491
 492         /**
 493          * Do these two comments, without checking the comment_ID, "match"?
 494          *
 495          * @param mixed $comment1 A comment object or array.
 496          * @param mixed $comment2 A comment object or array.
 497          * @return bool Whether the two comments should be treated as the same comment.
 498          */
 499         private static function comments_match( $comment1, $comment2 ) {
 500                 $comment1 = (array) $comment1;
 501                 $comment2 = (array) $comment2;
 502
 503                 return (
 504                            isset( $comment1['comment_post_ID'], $comment2['comment_post_ID'] )
 505                         && intval( $comment1['comment_post_ID'] ) == intval( $comment2['comment_post_ID'] )
 506                         && $comment1['comment_author'] == $comment2['comment_author']
 507                         && $comment1['comment_author_email'] == $comment2['comment_author_email']
 508                 );
 509         }
 510
 511         // Does the supplied comment match the details of the one most recently stored in self::$last_comment?
 512         public static function matches_last_comment( $comment ) {
 513                 if ( is_object( $comment ) )
 514                         $comment = (array) $comment;
 515
 516                 return self::comments_match( self::$last_comment, $comment );
 517         }
 518
 519         private static function get_user_agent() {
 520                 return isset( $_SERVER['HTTP_USER_AGENT'] ) ? $_SERVER['HTTP_USER_AGENT'] : null;
 521         }
 522
 523         private static function get_referer() {
 524                 return isset( $_SERVER['HTTP_REFERER'] ) ? $_SERVER['HTTP_REFERER'] : null;
 525         }
 526
 527         // return a comma-separated list of role names for the given user
 528         public static function get_user_roles( $user_id ) {
 529                 $roles = false;
 530
 531                 if ( !class_exists('WP_User') )
 532                         return false;
 533
 534                 if ( $user_id > 0 ) {
 535                         $comment_user = new WP_User( $user_id );
 536                         if ( isset( $comment_user->roles ) )
 537                                 $roles = join( ',', $comment_user->roles );
 538                 }
 539
 540                 if ( is_multisite() && is_super_admin( $user_id ) ) {
 541                         if ( empty( $roles ) ) {
 542                                 $roles = 'super_admin';
 543                         } else {
 544                                 $comment_user->roles[] = 'super_admin';
 545                                 $roles = join( ',', $comment_user->roles );
 546                         }
 547                 }
 548
 549                 return $roles;
 550         }
 551
 552         // filter handler used to return a spam result to pre_comment_approved
 553         public static function last_comment_status( $approved, $comment ) {
 554                 // Only do this if it's the correct comment
 555                 if ( is_null(self::$last_comment_result) || ! self::matches_last_comment( $comment ) ) {
 556                         self::log( "comment_is_spam mismatched comment, returning unaltered $approved" );
 557                         return $approved;
 558                 }
 559
 560                 // bump the counter here instead of when the filter is added to reduce the possibility of overcounting
 561                 if ( $incr = apply_filters('akismet_spam_count_incr', 1) )
 562                         update_option( 'akismet_spam_count', get_option('akismet_spam_count') + $incr );
 563
 564                 return self::$last_comment_result;
 565         }
 566
 567         /**
 568          * If Akismet is temporarily unreachable, we don't want to "spam" the blogger with
 569          * moderation emails for comments that will be automatically cleared or spammed on
 570          * the next retry.
 571          *
 572          * For comments that will be rechecked later, empty the list of email addresses that
 573          * the moderation email would be sent to.
 574          *
 575          * @param array $emails An array of email addresses that the moderation email will be sent to.
 576          * @param int $comment_id The ID of the relevant comment.
 577          * @return array An array of email addresses that the moderation email will be sent to.
 578          */
 579         public static function disable_moderation_emails_if_unreachable( $emails, $comment_id ) {
 580                 if ( ! empty( self::$prevent_moderation_email_for_these_comments ) && ! empty( $emails ) ) {
 581                         $comment = get_comment( $comment_id );
 582
 583                         foreach ( self::$prevent_moderation_email_for_these_comments as $possible_match ) {
 584                                 if ( self::comments_match( $possible_match, $comment ) ) {
 585                                         update_comment_meta( $comment_id, 'akismet_delayed_moderation_email', true );
 586                                         return array();
 587                                 }
 588                         }
 589                 }
 590
 591                 return $emails;
 592         }
 593
 594         public static function _cmp_time( $a, $b ) {
 595                 return $a['time'] > $b['time'] ? -1 : 1;
 596         }
 597
 598         public static function _get_microtime() {
 599                 $mtime = explode( ' ', microtime() );
 600                 return $mtime[1] + $mtime[0];
 601         }
 602
 603         /**
 604          * Make a POST request to the Akismet API.
 605          *
 606          * @param string $request The body of the request.
 607          * @param string $path The path for the request.
 608          * @param string $ip The specific IP address to hit.
 609          * @return array A two-member array consisting of the headers and the response body, both empty in the case of a failure.
 610          */
 611         public static function http_post( $request, $path, $ip=null ) {
 612
 613                 $akismet_ua = sprintf( 'WordPress/%s | Akismet/%s', $GLOBALS['wp_version'], constant( 'AKISMET_VERSION' ) );
 614                 $akismet_ua = apply_filters( 'akismet_ua', $akismet_ua );
 615
 616                 $content_length = strlen( $request );
 617
 618                 $api_key   = self::get_api_key();
 619                 $host      = self::API_HOST;
 620
 621                 if ( !empty( $api_key ) )
 622                         $host = $api_key.'.'.$host;
 623
 624                 $http_host = $host;
 625                 // use a specific IP if provided
 626                 // needed by Akismet_Admin::check_server_connectivity()
 627                 if ( $ip && long2ip( ip2long( $ip ) ) ) {
 628                         $http_host = $ip;
 629                 }
 630
 631                 $http_args = array(
 632                         'body' => $request,
 633                         'headers' => array(
 634                                 'Content-Type' => 'application/x-www-form-urlencoded; charset=' . get_option( 'blog_charset' ),
 635                                 'Host' => $host,
 636                                 'User-Agent' => $akismet_ua,
 637                         ),
 638                         'httpversion' => '1.0',
 639                         'timeout' => 15
 640                 );
 641
 642                 $akismet_url = "http://{$http_host}/1.1/{$path}";
 643                 $response = wp_remote_post( $akismet_url, $http_args );
 644                 Akismet::log( compact( 'akismet_url', 'http_args', 'response' ) );
 645                 if ( is_wp_error( $response ) )
 646                         return array( '', '' );
 647
 648                 return array( $response['headers'], $response['body'] );
 649         }
 650
 651         // given a response from an API call like check_key_status(), update the alert code options if an alert is present.
 652         private static function update_alert( $response ) {
 653                 $code = $msg = null;
 654                 if ( isset( $response[0]['x-akismet-alert-code'] ) ) {
 655                         $code = $response[0]['x-akismet-alert-code'];
 656                         $msg  = $response[0]['x-akismet-alert-msg'];
 657                 }
 658
 659                 // only call update_option() if the value has changed
 660                 if ( $code != get_option( 'akismet_alert_code' ) ) {
 661                         if ( ! $code ) {
 662                                 delete_option( 'akismet_alert_code' );
 663                                 delete_option( 'akismet_alert_msg' );
 664                         }
 665                         else {
 666                                 update_option( 'akismet_alert_code', $code );
 667                                 update_option( 'akismet_alert_msg', $msg );
 668                         }
 669                 }
 670         }
 671
 672         public static function load_form_js() {
 673                 wp_enqueue_script( 'akismet-form', AKISMET__PLUGIN_URL . '_inc/form.js', array( 'jquery' ), AKISMET_VERSION );
 674                 wp_print_scripts( 'akismet-form' );
 675         }
 676
 677         public static function inject_ak_js( $fields ) {
 678                 echo '<p style="display: none;">';
 679                 echo '<input type="hidden" id="ak_js" name="ak_js" value="' . mt_rand( 0, 250 ) . '"/>';
 680                 echo '</p>';
 681         }
 682
 683         private static function bail_on_activation( $message, $deactivate = true ) {
 684 ?>
 685 <!doctype html>
 686 <html>
 687 <head>
 688 <meta charset="<?php bloginfo( 'charset' ); ?>">
 689 <style>
 690 * {
 691         text-align: center;
 692         margin: 0;
 693         padding: 0;
 694         font-family: "Lucida Grande",Verdana,Arial,"Bitstream Vera Sans",sans-serif;
 695 }
 696 p {
 697         margin-top: 1em;
 698         font-size: 18px;
 699 }
 700 </style>
 701 <body>
 702 <p><?php echo esc_html( $message ); ?></p>
 703 </body>
 704 </html>
 705 <?php
 706                 if ( $deactivate ) {
 707                         $plugins = get_option( 'active_plugins' );
 708                         $akismet = plugin_basename( AKISMET__PLUGIN_DIR . 'akismet.php' );
 709                         $update  = false;
 710                         foreach ( $plugins as $i => $plugin ) {
 711                                 if ( $plugin === $akismet ) {
 712                                         $plugins[$i] = false;
 713                                         $update = true;
 714                                 }
 715                         }
 716
 717                         if ( $update ) {
 718                                 update_option( 'active_plugins', array_filter( $plugins ) );
 719                         }
 720                 }
 721                 exit;
 722         }
 723
 724         public static function view( $name, array $args = array() ) {
 725                 $args = apply_filters( 'akismet_view_arguments', $args, $name );
 726
 727                 foreach ( $args AS $key => $val ) {
 728                         $$key = $val;
 729                 }
 730
 731                 load_plugin_textdomain( 'akismet' );
 732
 733                 $file = AKISMET__PLUGIN_DIR . 'views/'. $name . '.php';
 734
 735                 include( $file );
 736         }
 737
 738         /**
 739          * Attached to activate_{ plugin_basename( __FILES__ ) } by register_activation_hook()
 740          * @static
 741          */
 742         public static function plugin_activation() {
 743                 if ( version_compare( $GLOBALS['wp_version'], AKISMET__MINIMUM_WP_VERSION, '<' ) ) {
 744                         load_plugin_textdomain( 'akismet' );
 745
 746                         $message = '<strong>'.sprintf(esc_html__( 'Akismet %s requires WordPress %s or higher.' , 'akismet'), AKISMET_VERSION, AKISMET__MINIMUM_WP_VERSION ).'</strong> '.sprintf(__('Please <a href="%1$s">upgrade WordPress</a> to a current version, or <a href="%2$s">downgrade to version 2.4 of the Akismet plugin</a>.', 'akismet'), 'https://codex.wordpress.org/Upgrading_WordPress', 'http://wordpress.org/extend/plugins/akismet/download/');
 747
 748                         Akismet::bail_on_activation( $message );
 749                 }
 750         }
 751
 752         /**
 753          * Removes all connection options
 754          * @static
 755          */
 756         public static function plugin_deactivation( ) {
 757                 //tidy up
 758         }
 759
 760         public static function log( $akismet_debug ) {
 761                 if ( defined( 'WP_DEBUG_LOG' ) && WP_DEBUG_LOG )
 762                         error_log( print_r( compact( 'akismet_debug' ), 1 ) ); //send message to debug.log when in debug mode
 763         }
 764 }